Antipsychotics lack alpha 1A/B adrenoceptor subtype selectivity in the rat.

Department of Mental Health, The Queen's University of Belfast, Whitla Medical Building, 97 Lisburn Rd., Belfast BT9 7BL, UK. m.cahir@qub.ac.uk

European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology 2005 Mar

filter terms:

The alpha1A- and alpha1B-adrenoceptor affinity of the typical (chlorpromazine, haloperidol, pimozide, thioridazine and trifluoperazine) and atypical (clozapine, olanzapine, quetiapine, risperidone and sertindole) antipsychotics was determined by competition binding at alpha1A- and alpha1B-adrenoceptors in rat submaxillary gland and liver. Although all antipsychotics bound to both subtypes with relatively high affinity (K(i)s<74 nM), none were selective (>10-fold). Comparison with published dopamine D2 receptor affinities suggests that antipsychotic blockade of alpha1A- and/or alpha1B-adrenoceptors may contribute to the antipsychotic activity of all the atypical and several of the typical antipsychotics examined.

Citation

Marie Cahir, David J King. Antipsychotics lack alpha 1A/B adrenoceptor subtype selectivity in the rat. European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology. 2005 Mar;15(2):231-4